<div class="msr">
  <button nz-button nzType="primary">primary</button>
  <button nz-button>secondary</button>
  <button nz-button nz-dropdown [nzDropdownMenu]="menu">
    Actions
    <span nz-icon nzType="down"></span>
  </button>
  <nz-dropdown-menu #menu="nzDropdownMenu">
    <ul nz-menu>
      <li nz-menu-item>1st menu item</li>
      <li nz-menu-item>2nd menu item</li>
      <li nz-menu-item>3rd menu item</li>
    </ul>
  </nz-dropdown-menu>
</div>
